Improvement in clamp



' tnitrd States L Evi WHARTON, or SALEM-OHIO.

Leners Paen.zN0.106,900,aatd August 30,1870.

v1MrRovrnrxrzN'J.' IN CLAMP.

The Schedule referred to in these Letters Patent and making par): of the same.

To all lwhom 'it may concern Be it known that I, LEVI WHARTON, of Salem, in the count-y of Columbianaand State of Ohio, have invented .a new and useful Improvement in Screw- Clamps, of which the following is a full, clear, and exnot description.

My invention relates to an improvement in clamps, -such as are used by wood-workers and' others for clamping their work. A lts object is to produce a simple, stroug,and easlyfadjust-able screw-clamp, that obviates the necessity of using a very long screw or turning it many times to clamp the work; and

The improyement consists in using a ratchet bar, in combination with air-Sdink and avset-screw.

In the accompanying drawing- Figure lis aside elevat-ion of my improvement, with part of the lilik broken away;

. .Figure 2, a perspective view oi the link; and

Figure 3, a cross-section taken in the line a; x of fig. l.

The bar A is formed with a toothed rack, a, on ,one of its edges, and having the corners of the lower edge chanifered to a V or hatchet-edge, Aas clearly shown in iig. 3, The har A also has one of its ends bent" at right angles to its length.

A thread tapped through it receives the set-screw B, which is of usual form, and has a collar, b. turning loosely on one of its ends. 'lhe collar imp inges against the work to be clamped, and allows the screw to be turned independently of it.

The link C is of peculiar form, having one of its ends bent at right angles to its length, and corresponding in shape with the collar b of the set-screw.-

Ihe other end of the link is curved in the opposite direction, and has a slot, c,`passing transversely through it, forminga stirrup, which embraces the 'bar A and engages in its teeth.

The link G has also a V-groove, c', passingalong its upper side, and formed to receive the hatchet edge of the har A, which prevents a-laterai movement of' the lilik.

In operation the :link may be-adjusted to a .close approximation to the sizeof the work, and thus necessitate but a short movement of the. screw.

I do not claim, broadly, screw-clamps constructed Vwith an adjustable arm, this construct-ion being com- G.D. Lanibertspaten't of March 8, 1870, may' mon. be regarded as a type ot'tliis class, In that patent the rack is below the bar,l and a spring is usedto keep the teeth of the adjustable arm in contact with those of the rack, while in my improved clamp I substitute a link for the arm and dispense with the spring, thusl securing a cheaper, simpler, and more etlicien't instrumeut. l

I claim asmy invention- 'lhe combination of the bar,` having a V-shaped edge on one side, a ratchet on the other side, a nut` for the clamp-screw, and the clamping-screw, with the *'S-shaped link, slotted at one end to embrace the bar, vgrooved on one side correspondinglyI with the Vf shaped edge of the bar, and having a clamping-head on.the other end, all these parts being constructed to operate in combination as hereinbefore set forth.

In testimony whereof I have hereun'tosubscribed my name.

LEVI WHARTON. Witnesses:

R. V. HAMrsoN, NATHAN HUNT'. 

